Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Heinonen, Juha and Koskela, Pekka and Shanmugalingam, Nageswari and Tyson, Jeremy T.",Sobolev spaces on metric measure spaces : an approach based on upper gradients,,Cambridge University Press,2015,New mathematical monographs,,9781107092341,,https://cir.nii.ac.jp/crid/1130282269102284288